In the traditional ZVT soft-switching DC-DCconverters, the resonant energy transmission path iscomplicated and the auxiliary switches may operate in hardswitching. This paper proposes an energy-feedforward ZVTsoft-switching Buck converter, all the switches keep softswitching operation, and the resonant energy is transmitteddirectly to the load through the forward transformer instead ofreturning to the source or indirectly flowing to load, which isconducive to improve the conversion efficiency. Aftertheoretical analysis, the design process of key parameters isgiven, and verified through simulation. Finally, an experimentalprototype is constructed with 200W output, 200kHz operatingfrequency. The experimental results show that soft-switchingoperation of all switches is maintained in load range from 10%to rated power. Compared with the traditional hard-switchingBuck, the voltage and current spike of the main switch arereduced largely, the efficiency is better in the whole test range,improved from 94.54% to 97.34% at full load.